I also suffer from CAD. I have been treated with prednisone also but more recently with Rituximab which is given by infusion. This has successfully kept my haemoglobin at a better level and more stable. It doesn't work for eveyone but definitely worth a try. You have 1 infusion every week for 4 weeks. Other advice is to really keep warm - don't drink cold drinks or food straight from fridge.
Let me know if you want to know more.